Explaining computerized English testing in plain English

色猫AV Languages
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Research has shown that automated scoring can give more reliable and objective results than human examiners when evaluating a person’s mastery of English. This is because an automated scoring system is impartial, unlike humans, who can be influenced by irrelevant factors such as a test taker’s appearance or body language. Additionally, automated scoring treats regional accents equally, unlike human examiners who may favor accents they are more familiar with. Automated scoring also allows individual features of a spoken or written test question response to be analyzed independent of one another, so that a weakness in one area of language does not affect the scoring of other areas.

was created in response to the demand for a more accurate, objective, secure and relevant test of English. Our automated scoring system is a central feature of the test, and vital to ensuring the delivery of accurate, objective and relevant results – no matter who the test-taker is or where the test is taken.

Development and validation of the scoring system to ensure accuracy

PTE Academic’s automated scoring system was developed after extensive research and field testing. A prototype test was developed and administered to a sample of more than 10,000 test takers from 158 different countries, speaking 126 different native languages. This data was collected and used to train the automated scoring engines for both the written and spoken PTE Academic items.

To do this, multiple trained human markers assess each answer. Those results are used as the training material for machine learning algorithms, similar to those used by systems like Google Search or Apple’s Siri. The model makes initial guesses as to the scores each response should get, then consults the actual scores to see well how it did, adjusts itself in a few directions, then goes through the training set over and over again, adjusting and improving until it arrives at a maximally correct solution – a solution that ideally gets very close to predicting the set of human ratings.

Once trained up and performing at a high level, this model is used as a marking algorithm, able to score new responses just like human markers would. Correlations between scores given by this system and trained human markers are quite high. The standard error of measurement between 色猫AV’s system and a human rater is less than that between one human rater and another – in other words, the machine scores are more accurate than those given by a pair of human raters, because much of the bias and unreliability has been squeezed out of them. In general, you can think of a machine scoring system as one that takes the best stuff out of human ratings, then acts like an idealized human marker.

色猫AV conducts scoring validation studies to ensure that the machine scores are consistently comparable to ratings given by skilled human raters. Here, a new set of test-taker responses (never seen by the machine) are scored by both human raters and by the automated scoring system. Research has demonstrated that the automated scoring technology underlying PTE Academic produces scores comparable to those obtained from careful human experts. This means that the automated system “acts” like a human rater when assessing test takers’ language skills, but does so with a machine's precision, consistency and objectivity.

Scoring speaking responses with 色猫AV’s Ordinate technology

The spoken portion of PTE Academic is automatically scored using 色猫AV’s Ordinate technology. Ordinate technology results from years of research in speech recognition, statistical modeling, linguistics and testing theory. The technology uses a proprietary speech processing system that is specifically designed to analyze and automatically score speech from fluent and second-language English speakers. The Ordinate scoring system collects hundreds of pieces of information from the test takers’ spoken responses in addition to just the words, such as pace, timing and rhythm, as well as the power of their voice, emphasis, intonation and accuracy of pronunciation. It is trained to recognize even somewhat mispronounced words, and quickly evaluates the content, relevance and coherence of the response. In particular, the meaning of the spoken response is evaluated, making it possible for these models to assess whether or not what was said deserves a high score.

Scoring writing responses with Intelligent Essay Assessor? (IEA)

The written portion of PTE Academic is scored using the Intelligent Essay Assessor? (IEA), an automated scoring tool powered by 色猫AV’s state-of-the-art Knowledge Analysis Technologies? (KAT) engine. Based on more than 20 years of research and development, the KAT engine automatically evaluates the meaning of text, such as an essay written by a student in response to a particular prompt. The KAT engine evaluates writing as accurately as skilled human raters using a proprietary application of the mathematical approach known as Latent Semantic Analysis (LSA). LSA evaluates the meaning of language by analyzing large bodies of relevant text and their meanings. Therefore, using LSA, the KAT engine can understand the meaning of text much like a human.

What aspects of English does PTE Academic assess?

Written scoring

Spoken scoring
  • Word choice
  • Grammar and mechanics
  • Progression of ideas
  • Organization
  • Style, tone
  • Paragraph structure
  • Development, coherence
  • Point of view
  • Task completion
  • Sentence mastery
  • Content
  • Vocabulary
  • Accuracy
  • Pronunciation
  • Intonation
  • Fluency
  • Expressiveness
  • Pragmatics

More blogs from 色猫AV

  • A woman reading outside with a book

    Three ways English students can learn to read at home

    By Kate Fitzpatrick
    Reading time: 4 minutes

    Read more at home if you want to learn English faster: three ways to get into the habit

    I can hear parents, ELT learners and teachers all over the world thinking to themselves: We know it helps if English students learn to read for pleasure at home, but how are we supposed to find the time? Who is buying these materials? What if a parent doesn’t speak English themselves?

    That’s the beauty of reading at home, also called extensive reading: it’s completely autonomous and parents can be as involved as much or little as they like. There’s more good news as it’s never been cheaper to assemble a selection of extensive readers for your children or students, meaning that cost is no longer so much of a barrier to reading at home.

    Is extensive reading really that critical to learning English?

    Stephen D. Krashen’s [1]??offers a marvellous summary and critique of extensive reading studies around the world, concluding that:

    "When [second language learners] read for pleasure, they can continue to improve in their second language without classes, without teachers, without study and even without people to converse with.’"?(Krashen 1993 p. 84)

    Philip Prowse’s excellent article, “What is the secret of extensive reading?”[2]?agrees with Krashen’s conclusion.

    Prowse goes into more detail about efficacy studies at primary, secondary and adult levels. This body of evidence finds that reading for pleasure improves results in grammar, writing, speaking and fluency, as well as comprehension and vocabulary – both alongside and instead of traditional textbooks.

    So, we know it works. As with so many education-related things, the question is how to implement them. Christine Nuttall talks about the virtuous circle of reading – once a learner begins to enjoy reading, they are more likely to read more and benefit more from it, so they learn to read more, and so on.

    The reverse is also true. The questions then follow: how do we motivate our Instakids to read at home in English, if they won’t read in their first language? How do we carve out time between travel, work, school and homework? Here are three ways you can form the habit of reading at home:

    1. Learners need access to extensive reading material at home to use it

    Krashen establishes this common-sense fact based on five studies from 1983 to 2003.[2]?It can be a reading app, an online library subscription or a pile of readers in the corner – whatever it is, it has to be the right level for the student and it has to be a topic they’re interested in, or they’ll never learn to read for pleasure.

    Negative reading habits can happen simply because there isn’t much available to the learner: Worthy and McCool studied 11 sixth-graders in 1998 who "hated to read", and found a direct correlation between those students and the lack of reading material at home.[3] Thankfully, we now have more options than we used to:

    For extensive reading online, the Extensive Reading Foundation offers good-quality, free materials, in audio and print, at its .?These text resources and audiobooks tend to be quite basic and the stories are largely classics. You can choose by level and genre, and there is also a publisher directory.

    • You can purchase full 色猫AV English Readers and other publishers’ Kindle editions on the Kindle store, iBookstore and Google Play, and read them on an e-reader, phone or tablet using the Kindle app. These are finely-graded, contemporary, relevant e-books with titles like , , , , , , and .
    • An e-book library subscription can be a cost-effective way to get access to a lot of e-books online through your browser. is a Japanese-run online library which offers hundreds of full-text graded readers, from reputable publishers, and charges about $19 per year.
    • For print readers, cost can be an issue. If you can't buy readers at your local bookshop from a publisher like 色猫AV, you can buy first- or second-hand readers cheaply from Amazon or the Book Depository, or you can ask your school to let you know when they’re upgrading their readers library, as you may be able to take some of the older books home.

    2.?Make the most of the commute or the school run

    The key here is routine – give it a try and see if it works for you. Reading doesn’t just happen on a page. Today’s English learners have multiple ways to read for pleasure on their various devices as well as in print, all of which are well-adapted for reading and listening on the train/on the bus/in the car/on foot.

    I listen to podcasts on my commute by train and, to this day, I know my times tables thanks to a tape my mother used to play in the car on the way to primary school.

    • Download a podcast or audiobook. Ideally, an English learner would both read and listen, but one or the other is better than nothing. Audible.com has plenty of English extensive readers in audiobook format, and a year’s membership is $10 per month, or you can buy individual audiobooks. There are classic extensive reading podcasts available on iTunes for $4.99 each.
    • Never underestimate your public library.??is an online service that finds your local library for you, wherever you are in the world. You can also search by title and see which libraries carry that particular book. Just think: you could create an instant, extensive reading library at your home for free that changes every month.

    3. Consider the power of rewards

    You can reward your child or reward yourself for building a reading habit. Remember, we are talking about starting a virtuous circle: persuading a learner to begin a new habit of reading in English for pleasure. Reward mechanisms can be very effective.

    This idea should be explored on a case-by-case basis – it depends on what you or your child responds to best. In my opinion, starting a reading habit is well worth a glass of wine, a chocolate treat, or an extra half-hour playing video games.

    References

    [1]?Krashen, Stephen D. (2004)?,?p57

    [2]? Prowse, Philip: “”?

    [3] Worthy, J. and McKool, S. (1996): “” in Ibid, p61